RestHighLevelClient in spring boot 2.1.x doesn't allow a spring cloud task to finish successfully

[VernonG (Matthew Griffin)]

Steps to reproduce :

1. Clone https://github.com/spring-cloud/spring-cloud-task/tree/master/spring-cloud-task-samples/timestamp
2. Run the application - The service dies after it prints the timestamp
3. Add:

                <dependency>
			<groupId>org.elasticsearch.client</groupId>
			<artifactId>elasticsearch-rest-high-level-client</artifactId>
			<version>7.0.0</version>
		</dependency>

4. Re-run the application - The service now stays alive

Notes
With:
Spring Cloud Task - Finchley.SR3
Spring Boot - 2.0.x
Rest High Level Client - 6.4.2
The app functions as intended.
With:
Spring Cloud Task - Greenwich.SR1
Spring Boot -2.1.x
Rest High Level Client - 6.4.2
The app exhibits the problematic behavior

Adding a configuration and beaning the RestHighLevelClient and closing the connection on task completion has no affect on this functionality.

[dadoonet (David Pilato)]

How do you run the application? Is it with mvn run?

When using springboot with
elasticsearch, you need to be explicit with some transitive dependencies as SpringBoot declares a version 6.4...

Basically you can put this in your pom.xml:

<properties>
  <elasticsearch.version>7.0.0<elasticsearch.version>
</properties>

See documentation here: https://docs.spring.io/spring-boot/docs/current/reference/html/howto-build.html#howto-customize-dependency-versions

May be that could help.